Wires up drag/drop for aura-mus

ui/aura/BUILD.gn

Index: ui/aura/BUILD.gn
diff --git a/ui/aura/BUILD.gn b/ui/aura/BUILD.gn
index 7c527e94f1ad688bf334b5d11ca3c8120bd582f1..e0af522525f7e61c69dbb7b7a39e51b7ed396720 100644
--- a/ui/aura/BUILD.gn
+++ b/ui/aura/BUILD.gn
@@ -15,8 +15,6 @@ component("aura") {
     "../wm/public/activation_delegate.h",
     "../wm/public/animation_host.cc",
     "../wm/public/animation_host.h",
-    "../wm/public/drag_drop_delegate.cc",
-    "../wm/public/drag_drop_delegate.h",
     "../wm/public/scoped_drag_drop_disabler.cc",
     "../wm/public/scoped_drag_drop_disabler.h",
     "../wm/public/scoped_tooltip_disabler.cc",
@@ -40,6 +38,8 @@ component("aura") {
     "client/default_capture_client.h",
     "client/drag_drop_client.cc",
     "client/drag_drop_client.h",
+    "client/drag_drop_delegate.cc",
+    "client/drag_drop_delegate.h",
     "client/event_client.cc",
     "client/event_client.h",
     "client/focus_change_observer.cc",
@@ -68,6 +68,9 @@ component("aura") {
     "input_state_lookup_win.h",
     "layout_manager.cc",
     "layout_manager.h",
+    "mus/drag_drop_controller_host.h",
+    "mus/drag_drop_controller_mus.cc",
+    "mus/drag_drop_controller_mus.h",
     "mus/in_flight_change.cc",
     "mus/in_flight_change.h",
     "mus/input_method_mus.cc",